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hooks.c
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hooks.c
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/**
* MIT License
*
* Copyright (c) 2022 MCUSec
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "harm.h"
ASM void HARM_PendSVHandler_Hook(void)
{
__asm volatile(
" .syntax unified \n"
" .extern HARM_ShuffleObjects \n"
" \n"
" tst lr, #8 \n"
" it eq \n"
" bxeq lr \n"
" tst lr, #64 \n"
" it ne \n"
" bxne lr \n"
" tst lr, #4 \n"
" ite eq \n"
" mrseq r0, msp_ns \n"
" mrsne r0, psp_ns \n"
" b HARM_ShuffleObjects \n"
);
}
ASM void HARM_SysTickHandler_Hook(void)
{
__asm volatile(
" .syntax unified \n"
" .extern g_systick_count \n"
" \n"
" cpsid i \n"
" ldr r0, =g_systick_count \n"
" ldr r1, [r0] \n"
" subs r1, #1 \n"
" cbnz r1, .L_return \n"
" ldr r2, =0xe000ed04 \n"
" ldr r3, [r2] \n"
" orrs r3, r3, #0x10000000 \n"
" str r3, [r2] \n"
" ldr r1, =%0 \n"
".L_return: \n"
" str r1, [r0] \n"
" cpsie i \n"
" bx lr \n"
" \n"
" .align 2 \n"
:: "i" (HARM_SHUFFLE_PERIOD_MS) : "memory"
);
}
void HARM_SecureFaultHandler_Hook(void)
{
__asm volatile("nop");
}